Scraper.



J. SHOSTBOM.

SCRAPER.

APPUCATION FILED 1uLY1s. 1915.

1 ,1 92,1 27. v Patented July 25, 1916.

@7071; Shostrorn/ WWI Gums UNITED "STATES PATENT OFFICE.

JOHN snosrnom, or TACOMA, WASHINGTON.-

somnn.

17 '0 all whom it may concern:

Be it known that I, JOHN SHos'rRoM, a citizen of the United States,residing atTacoma, in the county of Pierce and State of Washington, haveinvented certain new and useful Improvementsin Scrapers, ofwhich thefollowing is a specification.

This invention relates to earth scrapers and has for its object theprovision of means whereby when the scraper is drawn rearwardly thecpncave back plate and the scraper teeth will be protected and wear ofthe same avoided.

A further object of the invention is to so arrange the apron orprotecting shoe that it will be automatically shifted to a position inrear of the scraper or below the same when a pull is exerted on thescraper to effect travel of the same. v I

The stated objects of the invention and other objects which willincidentally appear are accomplished in a mechanism such as isillustrated in the accompanying drawings, and the invention resides incertain novel features which will be first duly described and then moreparticularly pointed out in the claims following the description.

Inthe drawings: Figure 1 is a perspective View of a scraper embodying myimprovements, Fig. 2 is a longitudinal section of the same showing theparts arranged to permit rearward travel of the scraper, and

Fig. 3 is a side elevation showing the parts in the position assumedwhen the scraper is at work.

The scraper illustrated consists of side plates 1 and a concave backplate 2 connecting the rear edges of the said side plates. Draft cables3 are attached to the front ends of the side plates, and the back plate2 has its lower edge projecting slightly below the lower edges of theside plates and extending forwardly, as clearly shown in Figs. 2 and 3.The said rear plate or back of the scraper may be secured to the sideplates in any convenient or preferred manner, and in the drawings, Ihave illustrated the said back as constructed with flanges 4 which fitagainst the inner surfaces of the side plates and are riveted orotherwise rigidly secured thereto. This construction, however, isillustrative only and any other preferred construction may be employed.

- Along the loweredge of the back 2 are secured the usual scraper orexcavator teeth 21 and on the side plates are keeper platesSpecification of Letters Patent.

Patented'July 25-, 1916.

Application filed July 13, 1915. Serial No. 39,569.

or brackets 22. Pivots .7 in the rear ends of said brackets support thestandards or arms 6 which project upwardly adjacent the outer faces ofthe side plates and carry the'apron or runner plate 5, the pivots 7being preferably at the center of the arc defined by the back 2 so thatthe said plate or apron may swing rearwardly to the position shown inFig. 3 without binding upon the back or being restricted by anyinterference with the back. The rear portion of the apron is curvedupwardly, as shown at 8, and at the center of the said upturned portion,I secure the end of a cable 9 which' passes upwardly to and over apulley10 mounted upon the back 2 near the upper edge thereof and then extendsforwardly above the scraper and is connected to the draft devices. Ialso secure to the rear edge of the apron or runner plate other cables11 which extend rearwardly therefrom to the enginel It is thought theoperation of the device will be readily understood from the fore- Igoing description, taken in connection with the accompanying drawingsWhen the scraper is at work to level the surface of the ground, theparts are arranged as shown in Fig. 3 and the scrap'er is drawn forwardover the surface to be treated by power applied from the engine to thecables 3. The teeth 21 will, of course, take into the surface soil andcut oil the projecting portions of the same, and the soil thus cut offwill accumulate thereon and against the back 2. Inasmuch as the cable 9is connected with the cables 3, the application of power to haul thescraper forward will draw the cable 9 to the position shown in Fig. 3thereby lifting the apron or runner plate about its pivotal connectionwith the side plates to a position in rear of the back 2. After the loadhas been discharged or the scraper has reached the end of its prescribedtravel. a

pull is exerted upon the cables ll'which will cause the apron to swingdownwardly and forwardly,,the edge of the same striking the to return tothe position shown in Fig. 2

under the influence of gravity. It will be understood, of course, thatthe cables 3 and 9 are, slack when a'pull is exerted on the cables-11and that the continuance of the pull through the latter cables will drawthe scraper rearwardly over the ground. *Ingits rearward movement, thescraper will ride on the apron and the back plate and teeth will be outof contact with the ground so that they will not be subjected to anywear.

My device may be applied to any scraper at a slight cost and willgreatly prolong the life of the same. 1

Having thus described the invention, What is claimed as new is 1. Thecombination with a scraper, of brackets secured to the sides thereof andoffset therefrom, a runner plate, standards at the ends of the runnerplate intermediate the front and rear edges of the same and having theirupper ends disposed between the sides of the scraper and the offsetbrackets, pivots inserted through said brackets and the upper ends ofthe standards into a draft cable connected to the front end of thescraper, a cable secured to and extending rearwardlv from the runnerplate, and

a second cable secured to the runner plate and passing upwardlytherefrom and forwardly over the said pulley and secured to the draftcable.

2. The combination with a scraper, ofa runner plate, standards risingfrom the ends of the runner plate intermediate the front and rear edgesthereof and having their upper ends pivoted to the sides of the scraper,and means for moving the runner plate to a position in rear of thescraper or to a position under the rear end of the same.

In testimony whereof I aflix my signature. Y JOHN SHOSTROM. [L.s.]

